4.3 Crosstalk Calibration

Crosstalk calibration overcomes a shift in the phase measurement due to pixel crosstalk, which can lead to embossing of borders where there are high amplitude contrasts. This artifact can be mitigated by convolving the phase map with a filter kernel function to null out phase contribution from the surrounding pixels.

Figure 28. Phase Shift at the Boundary of High Amplitude Variation has Extra Offset

To perform crosstalk calibration, place a small reflector at a distance such that the reflector becomes a single pixel in the image. Click Calibrate to sample the image for extracting the filter kernel function.

Figure 29. Crosstalk Calibration Window